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Date: Wed, 1 Apr 2015 11:10:48 -0500
From: Chris J Arges <chris.j.arges@canonical.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
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Subject: Re: smp_call_function_single lockups
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On Wed, Apr 01, 2015 at 02:43:36PM +0200, Ingo Molnar wrote:

<snip> 
> Have you already tested whether the hang goes away if you remove 
> irq-affinity fiddling daemons from the system? Do you have irqbalance 
> installed or similar mechanisms?
> 
> Thanks,
> 
> 	Ingo
>

Even with irqbalance removed from the L0/L1 machines the hang still occurs.
Using the debug patch as described here:
https://lkml.org/lkml/2015/4/1/338

This results in no 'apic: vector* or 'ack_APIC*' messages being displayed.

--chris
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